[turbofan] Add RoundUint32ToFloat32 operator to Turbofan.

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index f8a49c4968f97975ba1cc0b38bae2db3ffb69b10..eb99040ec19f82f314199f757700e8958dbb5418 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -1070,6 +1070,12 @@ void InstructionSelector::VisitRoundInt64ToFloat64(Node* node) {
 }
 
 
+void InstructionSelector::VisitRoundUint32ToFloat32(Node* node) {
+  X64OperandGenerator g(this);
+  Emit(kSSEUint32ToFloat32, g.DefineAsRegister(node), g.Use(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitRoundUint64ToFloat32(Node* node) {
   X64OperandGenerator g(this);
   InstructionOperand temps[] = {g.TempRegister()};